virtualbox.org

Hi,

I am struggling to work out how I can change the mac address on my XP guest (running under OSX).

for some reason I do not have the settings option available when I start virtual box, which I thought would maybe have the option). So I was looking at using
VBoxManage modifyvm --macaddress ,but to be honest I am not quite sure of the syntax I should use after that bit, or even if this the correct method

Thanks in advance, I have searched lots but cannot really seem to see anything.

Yes correct method.
Syntax like this:
VBoxManage modifyvm <vmname> --macaddressX 000027226F23
replace X with the number of your network card, vmname with the name of your machine and the macadress.

Thank you for your help

You should have the VM Settings available through a button in the main GUI. If it's disabled, that usually means that you're not allowed to change any setting, because it's in saved state or running. Changing settings when in one of these states can cause problems for the VM or even the OS inside it.
In the VM Settings, you can generate a new MAC address on the Network section. Hit the cog, that should give you the option you need.